<?php
/**
 * Zend Framework
 * LICENSE
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 * @category Zend
 * @package Zend_Filter
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 * @version $Id: Decrypt.php 24593 2012-01-05 20:35:02Z matthew $
 */
/**
 *
 * @see Zend_Filter_Decrypt
 */
require_once 'Zend/Filter/Decrypt.php';

/**
 * Decrypts a given file and stores the decrypted file content
 * @category Zend
 * @package Zend_Filter
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 */
class Zend_Filter_File_Decrypt extends Zend_Filter_Decrypt {

    /**
     * New filename to set
     * @var string
     */
    protected $_filename;

    /**
     * Returns the new filename where the content will be stored
     * @return string
     */
    public function getFilename () {
        return $this -> _filename;
    }

    /**
     * Sets the new filename where the content will be stored
     * @param string $filename (Optional) New filename to set
     * @return Zend_Filter_File_Encryt
     */
    public function setFilename ($filename = null) {
        $this -> _filename = $filename;
        return $this;
    }

    /**
     * Defined by Zend_Filter_Interface
     * Decrypts the file $value with the defined settings
     * @param string $value Full path of file to change
     * @return string The filename which has been set, or false when there were errors
     */
    public function filter ($value) {
        if ( ! file_exists ($value)) {
            require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception ("File '$value' not found");
        }
        if ( ! isset ($this -> _filename)) {
            $this -> _filename = $value;
        }
        if (file_exists ($this -> _filename) and  ! is_writable ($this -> _filename)) {
            require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception ("File '{$this->_filename}' is not writable");
        }
        $content = file_get_contents ($value);
        if ( ! $content) {
            require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception ("Problem while reading file '$value'");
        }
        $decrypted = parent::filter ($content);
        $result = file_put_contents ($this -> _filename, $decrypted);
        if ( ! $result) {
            require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception ("Problem while writing file '{$this->_filename}'");
        }
        return $this -> _filename;
    }

}
